Follow-up from "add example script to init; redo internal structure to a more oo style"

The following discussion from !67 (merged) should be addressed:

@hueser93 started a discussion: (+2 comments)

Shall we pass a container object that encapsulates the relevant instances and API that is needed by script developers here instead of the whole HIFISSurveyval instance as we discussed earlier in a video call?

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